A020366 Numbers n such that continued fraction for sqrt(n) has period 27.

949, 1109, 1261, 1354, 1361, 1402, 1721, 1889, 1921, 2221, 2561, 2957, 3229, 3821, 4021, 4373, 4481, 4973, 4985, 5473, 5545, 5729, 5765, 5825, 6065, 6322, 6458, 6617, 6730, 6869, 6925, 6938, 7109, 7913, 7985, 8077, 9034, 9146, 9178, 9509, 10061, 10930